Head replaceable hand tools

Abstract

A hand tool includes a handle with a polygonal recess defined in a connection end of the handle and a function head has an insertion which is removably inserted into the polygonal recess. The function head is able to engage with an object to be tightened or loosened and rotated with the handle.

1 . A hand tool comprising: 
 a handle having a connection end which includes a polygonal recess defined therein, and    a function head having an insertion which is removably inserted into the polygonal recess, the insertion having a protrusion extends radially from an outer periphery thereof.    
   
   
       2 . The hand tool as claimed in  claim 1 , wherein the insertion has a protrusion extends radially from an outer periphery thereof.  
   
   
       3 . The hand tool as claimed in  claim 1 , wherein the insertion has a magnet connected to an outer periphery thereof.  
   
   
       4 . The hand tool as claimed in  claim 1 , wherein the insertion  122  has a flexible engaging ring  124  mouted thereto.  
   
   
       5 . The hand tool as claimed in  claim 1 , wherein the polygonal recess includes at least one axial groove defined in an inner periphery thereof.  
   
   
       6 . The hand tool as claimed in  claim 1 , wherein the handle has two lugs extending therefrom and the connection end is pivotably connected between the two lugs.  
   
   
       7 . The hand tool as claimed in  claim 1 , wherein the polygonal recess is defined axially in the connection end and the insertion of the function head is axially inserted into the polygonal recess.